Book.
1827 - Gale Group | NCCO Corvey
Kjeld Søballé, Finn Kjær Christensen,
Calcar resorption is a significant complication after total hip arthroplasty and may result in technical problems at ... years after surgery to study factors associated with calcar resorption. The incidence of calcar resorption was 21%. Primary positive calcar-collar contact reduced the incidence of calcar resorption. Sufficient cementation of the medullary canal significantly reduced the incidence of calcar resorption, as did neutral and valgus positioning of ... component occurred more often in the group with calcar resorption. Middle-aged patients and men were more ...
Tópico(s): Total Knee Arthroplasty Outcomes
1988 - Elsevier BV | The Journal of Arthroplasty
B. M. Wroblewski, Paul D. Siney, Patricia A. Fleming, Peter Bobak,
The calcar femorale is a vertical plate of bone lying deep to the lesser trochanter and is formed as ... the femoral cortex into two distinct layers, the calcar femorale and the medial femoral cortex. They fuse ... A stem placed centrally will abut against the calcar femorale with little or no space for cement. Clearing of the calcar will offer space for a cement layer, which ... friction arthroplasties, with and without clearing of the calcar. In 330 patients who had an arthroplasty without clearing the calcar, there were ten revisions for aseptic loosening of ...
Tópico(s): Total Knee Arthroplasty Outcomes
2000 - British Editorial Society of Bone & Joint Surgery | Journal of Bone and Joint Surgery - British Volume
B. M. Wroblewski, Paul D. Siney, Patricia A. Fleming, Peter Bobak,
The calcar femorale is a vertical plate of bone lying deep to the lesser trochanter and is formed as ... the femoral cortex into two distinct layers, the calcar femorale and the medial femoral cortex. They fuse ... A stem placed centrally will abut against the calcar femorale with little or no space for cement. Clearing of the calcar will offer space for a cement layer, which ... friction arthroplasties, with and without clearing of the calcar. In 330 patients who had an arthroplasty without clearing the calcar, there were ten revisions for aseptic loosening of ...
Tópico(s): Orthopedic Infections and Treatments
2000 - British Editorial Society of Bone & Joint Surgery | Journal of Bone and Joint Surgery - British Volume
Lu Bai, Zhong-guo Fu, Shuai An, Peixun Zhang, Dianying Zhang, Baoguo Jiang,
To evaluate the effect of calcar screw use in proximal humeral fractures with unstable medial support treated with locked plates.Standard osteotomies were performed in 36 cadaveric ... groups with and without 5-mm medial deficiencies. Calcar screw function was measured in each group by ... in the normal alignment model with and without calcar screw application.Calcar screws improved rotational stability in the normal alignment ( ... 0.007) and varus (P = 0.002) groups. Calcar screws improved static and cyclic axial (P = 0. ...
Tópico(s): Orthopedic Surgery and Rehabilitation
2014 - Lippincott Williams & Wilkins | Journal of Orthopaedic Trauma
Simo Miettinen, Tatu J. Mäkinen, Inari Kostensalo, Keijo Mäkelä, Heini Huhtala, Jukka Kettunen, Ville Remes,
... the incidence of—and risk factors for—intraoperative calcar fracture, and assessed its influence on the risk ... cementless THAs (in 2,913 patients). 118 intraoperative calcar fractures were observed in these hips (3.7%). A control group of 118 patients/hips without calcar fractures was randomly selected. The mean follow-up ... were evaluated to determine risk factors for intraoperative calcar fracture.Results — The revision rates in the calcar fracture group and the control group were 10% ( ... respectively. The revision rate directly related to intraoperative calcar fracture was 7.6%. The Hardinge approach and ...
Tópico(s): Total Knee Arthroplasty Outcomes
2015 - Taylor & Francis | Acta Orthopaedica
Eric M. Padegimas, Benjamin Zmistowski, Cassandra Lawrence, Aaron Palmquist, Thema Nicholson, Surena Namdari,
Background Anatomic reduction and placement of an inferior calcar screw are strategies to prevent fixation failure in proximal humerus factures. Optimal position of the calcar screw remains unknown. Methods There were 168 shoulders ( ... maximum distance from the inferior screw to the calcar ("calcar distance") as well as a maximum ratio of this distance and the head diameter ("calcar ratio"). Results There were 26 of 168 (15. ... multivariate analyses found quality of reduction ( P < .001), calcar distance ( P < .001), and calcar ratio ( P < .001) ...
Tópico(s): Trauma Management and Diagnosis
2017 - Elsevier BV | Journal of Shoulder and Elbow Surgery
Kathryn E. Stanchak, Sharlene E. Santana,
... the membrane and limb musculature associated with the calcar, a neomorphic skeletal structure found in the hindlimbs ... tomography and standard histological techniques to examine the calcars and hindlimb membranes of three bat species that ... also assess the level of mineralization of the calcar at muscle attachment sites to better understand how muscle contraction may enable calcar function. We found that the arrangement of the calcar musculature varies among the three bat species, as does the pattern of mineral content within the calcar. M. molossus and M. californicus exhibit more complex ...
Tópico(s): Viral Infections and Vectors
2018 - Wiley | The Anatomical Record
Paul DeVito, Hyrum Judd, Andy Malarkey, Leah Elson, Emmanuel McNeely, Derek D. Berglund, Rushabh M. Vakharia, Jonathan C. Levy,
The incidence of medial calcar resorption has been shown to be common after uncemented total shoulder arthroplasty (TSA). With etiologies including stress shielding, debris-induced osteolysis, and infection, the clinical impact of medial calcar resorption has not been specifically examined. The purpose ... for glenoid and humeral component loosening. A new calcar resorption grading system was introduced to quantify the ... up periods of 50 and 46 months, respectively. Calcar resorption was identified in 110 patients (64.3%). ...
Tópico(s): Orthopedic Infections and Treatments
2019 - Elsevier BV | Journal of Shoulder and Elbow Surgery
Jacob Wilkerson, Navin D. Fernando,
... It is also critical that surgeons understand the calcar-canal ratio, described in Dorr et al. [6], ... the implant engages the lateral shoulder and medial calcar, and a third point near the distal aspect ... femoral fracture, typically at the level of the calcar. A diaphyseal-engaging stem may result in fracture ... indices: the cortical index and the canal-to-calcar isthmus ratio. The cortical index was defined as ... the cortical thickness (Fig. 2). The canal-to-calcar isthmus ratio was calculated on an AP radiograph ...
Tópico(s): Total Knee Arthroplasty Outcomes
2020 - Lippincott Williams & Wilkins | Clinical Orthopaedics and Related Research
Mei Jin, Lili Pang, Zhongchao Jiang,
Abstract Background The calcar femorale was identified long ago. However, our current understanding of the calcar is insufficient, and its related concepts are sometimes confused. The calcar femoral is an important anatomical structure of the ... overlooked. In trauma, tumors, or other diseases, the calcar femorale can be destroyed or changed pathologically. As ... fractures. How to address the destruction of the calcar femorale or the damage to the calcar femorale is discussed in this article. Main text ...
Tópico(s): Hip and Femur Fractures
2021 - BioMed Central | BMC Musculoskeletal Disorders
Tomonori Tetsunaga, Kazuo Fujiwara, Hirosuke Endo, Tomoko Tetsunaga, Naofumi Shiota, Tôru Satô, Toshifumi Ozaki,
We investigated whether the calcar femorale, a cortical septum in the region of the lesser trochanter of the femur, correlates with results of femoral stem ... II-IV, and 58 hips as normal.The calcar femorale was identified in 267 hips (96.4%). The calcar femorale was significantly shorter and more anteverted in ... hips. Significant differences in the shape of the calcar femorale were found according to the severity of ... wedge stems were inserted more parallel to the calcar femorale rather than femoral neck anteversion, while other ...
Tópico(s): Orthopedic Infections and Treatments
2017 - Korean Orthopaedic Association | Clinics in Orthopedic Surgery
Chan-Woo Park, Seung‐Jae Lim, Donghee Ye, Youn-Soo Park,
... We examined outcomes of cerclage cabling for intraoperative calcar cracks in THA with cementless tapered wedge stems. ... single institution. Of these, we identified 71 intraoperative calcar cracks (69 patients) managed by 2-mm cerclage ... of stem subsidence, and implant survivorship of the calcar crack group (68 THAs) were compared with those ... The mean stem subsidence was greater in the calcar crack group (2.0 vs 1.2 mm, ... 98.4%; log-rank, P = .987). In the calcar crack group, a Dorr type C femur and ... subsidence >3 mm. For the subgroup with 42 calcar cracks managed by a single cable applied proximal ...
Tópico(s): Orthopedic Infections and Treatments
2020 - Elsevier BV | The Journal of Arthroplasty
Shih‐Jie Lin, Yao-Hung Tsai, Tien‐Yu Yang, Shih-Hsun Shen, Kuo‐Chin Huang, Mel S. Lee,
... of the study were to examine how medial calcar support (MCS) affects the radiographic outcomes and to ... into two groups according to disruption of medial calcar. Our results revealed an increased rate of poor radiographic outcomes in patients with disrupted medial calcar. Osteonecrosis of the humeral head and redisplacement were ... had a positive causality with disruption of medial calcar ( P = 0.008 and 0.050, resp.). Deficient medial calcar, inadequate reduction, diabetes mellitus, chronic kidney disease, and ...
Tópico(s): Bone fractures and treatments
2015 - Hindawi Publishing Corporation | BioMed Research International
Kathryn E. Stanchak, Jessica H. Arbour, Sharlene E. Santana,
... we show that one of these elements—the calcar of bats (Chiroptera)—is a skeletal novelty that has anatomically diversified. Comparisons of evolutionary models of calcar length and corresponding disparity-through-time analyses indicate that the calcar diversified early in the evolutionary history of Chiroptera, ... the capacity for flight. This interspecific variation in calcar length and its relative proportion to tibia and ... flight-related behaviors. We also find that the calcar varies in its tissue composition among bats, which ...
Tópico(s): Amphibian and Reptile Biology
2019 - Oxford University Press | Evolution
Hui Song, Shi‐Min Chang, Sun-Jun Hu, Shou-Chao Du, Wenfeng Xiong,
... 3D CT with full-range observation: those with calcar support maintained in Group 1 and those with calcar support lost in Group 2. Demographic information, fracture ... NSA (neck-shaft angle), reduction quality score, and calcar fracture gapping were collected and compared. Logistic regression ... in the multivariable analysis. The reduction quality score, calcar fracture gapping in the AP (anteroposterior), and lateral ... in the multivariable analysis. The threshold value of calcar fracture gapping for the risk of loss was ...
Tópico(s): Spinal Fractures and Fixation Techniques
2022 - BioMed Central | BMC Musculoskeletal Disorders
Jonathan N. Lamb, Coltart Oliver, Adekanmbi Isaiah, Hemant Pandit, Todd Stewart,
Background A calcar collar may reduce risk of periprosthetic fracture of the femur, through collar contact. We estimated the effect of ... stem and then estimated the effect of initial calcar-collar separation on the likelihood of collar contact. ... groups of six composite left femurs with increasing calcar-collar separation in each group, underwent periprosthetic fracture ... and rotational work prior to fracture were estimated. Calcar collar contact prior to fracture was identified using high speed camera footage. Findings Where calcar-collar contact occurred fracture torque was greater (47. ...
Tópico(s): Total Knee Arthroplasty Outcomes
2021 - Elsevier BV | Clinical Biomechanics
Norman A. Johanson, John J. Callaghan, Eduardo A. Salvati, Robert L. Merkow,
... revised 13 years after implantation. Thirty millimeters of calcar resorption was noted radiographically. Evidence of stem bending ... cup was noted. The pathologic evaluation of removed calcar bone and cement revealed a histiocytic mass invading ... present. The bone-cement interface in the excised calcar region contained segments that showed active bone remodelling ... membrane. It is possible that this case of calcar resorption began with histiocytic activation and recruitment by ... fragmentation of cement, as motion occurred at the calcar bone-cement interface, and may represent an extreme ...
Tópico(s): Lipid metabolism and disorders
1986 - Lippincott Williams & Wilkins | Clinical Orthopaedics and Related Research
Chandrashekar J. Thakkar, Savyasachi C. Thakkar, Rajshekhar T. Kathalgere, Malhar N. Kumar,
... medial bone loss at the area of the calcar. We have presented a simple and effective technique of calcar grafting by harvesting cortical bone strut from the ... trochanteric fractures of the femur were treated with calcar grafting. The mean age was 79.2 years. The graft was harvested from the calcar region of the head and neck fragment of ... of 34 (94%) patients in our series, the calcar graft healed well without dislodgement. There was graft ... associated with subsidence of the implant and loosening. Calcar grafting using this technique provides stability to the ...
Tópico(s): Hip disorders and treatments
2015 - Springer Science+Business Media | Indian Journal of Orthopaedics
Ryunosuke Watanabe, Hajime Mishima, Sho Totsuka, Tomofumi Nishino, Masashi Yamazaki,
... is a contact between the collar and the calcar. The purpose of this study was to compare ... first model, the collar had contact with the calcar. The second model had a 1 mm gap between the calcar and the collar. The third model was constructed ... when the collar was in contact with the calcar than when a gap was left between the collar and the calcar. In particular, collar contact was highly effective in ... there was a gap at the collar and calcar interface and higher stability when there was contact between the collar and the calcar.
Tópico(s): Orthopedic Infections and Treatments
2023 - Elsevier BV | Arthroplasty Today
William H. Harris, John R. Allen,
... designed for use in patients in whom the calcar region is missing, hence called the calcar replacement device. Experience with its use in 18 hips has indicated that common causes for calcar deficiency requiring this implant are resorption of the calcar region secondary to failure of a prior THA, ... of the heterotopic bone and use of the calcar replacement device achieved restoration of an arc of ...
Tópico(s): Orthopedic Infections and Treatments
1981 - Lippincott Williams & Wilkins | Clinical Orthopaedics and Related Research
John L. Lewis, Michael J. Askew, Richard L. Wixson, Gerald M. Krámer, Richard R. Tarr,
... material, stem geometry, and the use of a calcar collar on the stresses in and around implanted ... alloy stem with a collar allows creation of calcar stresses of approximately 80 per cent of the ... A similar stem of cobalt-chromium alloy creates calcar stresses of 67 per cent of these normal ... corresponding cobalt-chromium-alloy stems. The achievability of calcar loading with a titanium prosthesis was demonstrated in ... gauge tests.Loosening of the femoral stem and calcar resorption are problems that are seen in many ...
Tópico(s): Orthopedic Infections and Treatments
1984 - Wolters Kluwer | Journal of Bone and Joint Surgery
Qí Zhāng, Wei Chen, Huaijun Liu, Zhiyong Li, Zhaohui Song, Jinshe Pan, Yingze Zhang,
Objective: To investigate the role of the calcar femorale in stress distribution in the proximal femur. Methods: Twenty‐five specimens of proximal femurs were fixed to simulate single‐limb stance. Strain ... N, respectively before and after disruption of the calcar femorale. Results: When a normal load was being ... anterior and lateral aspects, no matter whether the calcar femorale was disrupted or not. However after disruption of the calcar femorale, strain values in the posterior and medial ... anterior and lateral aspects decreased significantly. Conclusion: The calcar femorale redistributes stress in the proximal femur by ...
Tópico(s): Orthopaedic implants and arthroplasty
2009 - Wiley | Orthopaedic Surgery
Thomas Le Corroller, Melania Dediu, Vanessa Pauly, N. Pirró, Patrick Chabrand, Pierre Champsaur,
The femoral calcar is a dense internal septum reaching from the femoral neck to the distal part of the lesser trochanter. ... the shape, dimensions, and density of the femoral calcar. Then, its relation to the femoral cavity was ... the greatest length of the spur. The femoral calcar exhibited a variable shape classified as ridge-type ... the individuals (P < 0.001), to the femoral calcar dimensions (P < 0.001) and were higher in males (P < 0.001). The femoral calcar was constantly identified as a vertical plate of ...
Tópico(s): Orthopedic Infections and Treatments
2011 - Wiley | Clinical Anatomy
Samir Mehta, Matthew Chin, Jennifer Sanville, Surena Namdari, Michael W. Hast,
... locked plate fixation of proximal humerus fractures, the calcar is an important anchor point for screws providing ... result in a screw position outside of the calcar. To date, little is known about the consequences of "missing" the calcar during plate positioning. This study sought to characterize ... more definitive and provided further evidence that proximal calcar screw placements are undesirable and distal implant placement ... Results from this experiment suggest that missing the calcar proximally is deleterious to fixation strength, while it ...
Tópico(s): Bone fractures and treatments
2018 - Elsevier BV | Injury
Eric M. Padegimas, Gerard Chang, Kamran Namjouyan, Surena Namdari,
... Known predictors of fixation failure were assessed, including calcar distance, calcar ratio, and calcar restoration. Additionally, the presence of cross-threaded screws ... 47.1%) did not have restoration of the calcar (vs. 16/95 [16.8%]; P = .005). Conclusion ... locking screws and failure to restore the medial calcar can be a function of implant design, surgeon ...
Tópico(s): Trauma Management and Diagnosis
2019 - Elsevier BV | Journal of Shoulder and Elbow Surgery
Qiuke Wang, Ning Sheng, Biyu Rui, Yunfeng Chen,
... of this study was to explore why some calcar screws are malpositioned when a proximal humeral fracture ... to 89) were analyzed. In 49 fractures, the calcar screw was considered to be malpositioned; in 154 ... risk factor was found for malpositioning of the calcar screws. Only the neck-shaft angle was found ... between 130° and 150°, 91% (133/46) of calcar screws were in the optimal position. Conclusion The ... the key factor for the appropriate positioning of calcar screws when treating a proximal humeral fracture with ...
Tópico(s): Pelvic and Acetabular Injuries
2020 - British Editorial Society of Bone & Joint Surgery | The Bone & Joint Journal
Guo‐Chun Zha, Jia Liu, Yong Wang, Shuo Feng, Xiang‐Yang Chen, Kaijin Guo, Junying Sun,
... standard-length femoral stem with reconstruction of femoral calcar or using calcar replacing prosthesis for unstable intertrochanteric fractures in elderly ... distal fixation modular prosthesis without reconstruction of femoral calcar for unstable intertrochanteric fracture in patients aged 75 ... more, do not need to reconstruct the femoral calcar.Forty-two patients (42 hips) underwent bipolar HA ... years or more, without reconstruction of the femoral calcar, may achieve a satisfactory clinico-radiological outcome, and ...
Tópico(s): Cardiac, Anesthesia and Surgical Outcomes
2019 - Elsevier BV | Orthopaedics & Traumatology Surgery & Research
Claës Hierton, Gudmund Blomgren, Urban Lindgren,
... the primary hip disease were prone to develop calcar resorption. Patients who did not use supportive aids ... were more frequently represented in the group with calcar resorption. The CAD-prosthesis (Computer Assisted Design, Howmedica), was positively correlated to resorption at calcar at 6 months postoperatively compared to the Charnley- ... to occur more often in the group with calcar resorption. Mechanical factors are concluded to be predominant in early calcar resorption and are suggested to be of clinical ...
Tópico(s): Total Knee Arthroplasty Outcomes
1983 - Taylor & Francis | Acta Orthopaedica Scandinavica
Xi Chen, Yu Shen, Chenyi Ye, Mumingjiang Yishake, Jinwei Lu, Yunxian Yu,
... antiosteoporotic drugs on preventing periprosthetic bone loss in calcar 6 and 12 months after total hip arthroplasty. ... SUCRA) of the bone mineral density (BMD) in calcar (Gruen zone 7) as well as bone turnover ... 44.5%) were effective in retaining BMD in calcar; zoledronate was significantly more effective than etidronate (SMD= ... the top five drugs in retaining BMD in calcar at 12 months after total hip arthroplasty and ... periprosthetic bone loss after total hip arthroplasty in calcar, the effectiveness varied. Zoledronate was the best recommendation ...
Tópico(s): Orthopedic Infections and Treatments
2020 - Oxford University Press | Postgraduate Medical Journal